Bird Technologies Group 61170 Channelized Signal Booster User Manual

Bird Technologies Group Channelized Signal Booster

user manual

TX RX Systems Inc. 8625 Industrial Parkway, Angola, NY 14006 Tel: 716-549-4700 Fax: 716-549-4772 sales@txrx.com www.txrx.com

Installation and Operation Manual for

Channelized Signal Booster

Model 611-70

Manual Part Number

7-9469

Warranty

This warranty applies for one year from shipping date.

TX RX Systems Inc. warrants its products to be free from defect in material and workmanship at the time of shipment.

Our obligation under warranty is limited to replacement or repair, at our option, of any such products that shall have

been defective at the time of manufacture. TX RX Systems Inc. reserves the right to replace with merchandise of

equal performance although not identical in every way to that originally sold. TX RX Systems Inc. is not liable for dam-

age caused by lightning or other natural disasters. No product will be accepted for repair or replacement without our

prior written approval. The purchaser must prepay all shipping charges on returned products. TX RX Systems Inc.

shall in no event be liable for consequential damages, installation costs or expense of any nature resulting from the

purchase or use of products, whether or not they are used in accordance with instructions. This warranty is in lieu of all

other warranties, either expressed or implied, including any implied warranty or merchantability of fitness. No repre-

sentative is authorized to assume for TX RX Systems Inc. any other liability or warranty than set forth above in con-

nection with our products or services.

TERMS AND CONDITIONS OF SALE

PRICES AND TERMS:

Prices are FOB seller’s plant in Angola, NY domestic packaging only, and are subject to change without notice. Fed-

eral, State and local sales or excise taxes are not included in prices. When Net 30 terms are applicable, payment is

due within 30 days of invoice date. All orders are subject to a $100.00 net minimum.

QUOTATIONS:

Only written quotations are valid.

ACCEPTANCE OF ORDERS:

Acceptance of orders is valid only when so acknowledged in writing by the seller.

SHIPPING:

Unless otherwise agreed at the time the order is placed, seller reserves the right to make partial shipments for which

payment shall be made in accordance with seller’s stated terms. Shipments are made with transportation charges col-

lect unless otherwise specified by the buyer. Seller’s best judgement will be used in routing, except that buyer’s routing

is used where practicable. The seller is not responsible for selection of most economical or timeliest routing.

CLAIMS:

All claims for damage or loss in transit must be made promptly by the buyer against the carrier. All claims for shortages

must be made within 30 days after date of shipment of material from the seller’s plant.

SPECIFICATION CHANGES OR MODIFICATIONS:

All designs and specifications of seller’s products are subject to change without notice provided the changes or modifi-

cations do not affect performance.

RETURN MATERIAL:

Product or material may be returned for credit only after written authorization from the seller, as to which seller shall

have sole discretion. In the event of such authorization, credit given shall not exceed 80 percent of the original pur-

chase. In no case will Seller authorize return of material more than 90 days after shipment from Seller’s plant. Credit

for returned material is issued by the Seller only to the original purchaser.

ORDER CANCELLATION OR ALTERATION:

Cancellation or alteration of acknowledged orders by the buyer will be accepted only on terms that protect the seller

against loss.

NON WARRANTY REPAIRS AND RETURN WORK:

Consult seller’s plant for pricing. Buyer must prepay all transportation charges to seller’s plant. Standard shipping pol-

icy set forth above shall apply with respect to return shipment from TX RX Systems Inc. to buyer.

DISCLAIMER

Product part numbering in photographs and drawings is accurate at time of printing. Part number labels on TX RX

products supersede part numbers given within this manual. Information is subject to change without notice.

Bird Technologies Group TX RX Systems Inc.

Symbols Commonly Used

WARNING

ESD Electrostatic Discharge

Hot Surface

Electrical Shock Hazard

Important Information

CAUTION or ATTENTION

High Voltage

Heavy Lifting

Bird Technologies Group TX RX Systems Inc.

NOTE

Manual Part Number 7-9469

First Printing: March 2009

Version Number Version Date

1 03/30/09

1.1 06/10/09

For Class A Unintentional Radiators

This equipment has been tested and found to comply with the limits for a Class A digital device, pursuant

to Part 15 of the FCC rules. These limits are designed to provide resonable protection against harmful

interference when the equipment is operated in a commercial environment. This equipment generates,

uses, and can radiate radio frequency energy and, if not installed and used in accordance with the instruc-

tion manual, may cause harmful interference to radio communications. Operation of this equipment in a

residential area is likely to cause harmful interference in which the user will be required to correct the inter-

ference at his own expense.

WARNING: Changes or modifications which are not expressly approved by TXRX

Systems Inc. could void the user’s authority to operate the equipment.

ATTENTION: This device complies with Part 15 of the FCC rules. Operation is subject to the

following two conditions: (1) this device may not cause harmful interference and (2) this

device must accept any interference received, including interference that may cause undes-

ired operation.

Table of Contents Manual 7-9469-1.1 06/10/09

Table of Contents

Overview............................................................................................................... 1

Down / Up Conversion......................................................................................... 2

Unpacking ............................................................................................................ 2

Installation............................................................................................................ 2

Location ............................................................................................................. 2

Antenna Isolation ............................................................................................... 2

Required Equipment ......................................................................................... 2

Measurement Procedure .................................................................................. 3

Functional Block Diagram Description ............................................................. 4

Downlink / Uplink Input Signals ........................................................................... 4

Downlink / Uplink Output Signals ........................................................................ 4

Channel Module 3-22322 .................................................................................... 4

Operation.............................................................................................................. 6

Module LED’s ..................................................................................................... 6

RF Exposure ........................................................................................................ 6

Figures and Tables

Figure 1: The Down / Up Converter Process ....................................................... 1

Figure 2: Measuring Antenna Isolation................................................................. 3

Figure 3: Functional Block Diagram ..................................................................... 4

Figure 4A: Module housing Front View ................................................................ 5

Figure 4B: Module Housing rear View.................................................................. 5

Figure 5: Channel Module Block Diagram............................................................ 6

Table 1: Specifications .......................................................................................... 1

Table 2: Channel Module Indicator LED’s............................................................. 7

Table of Contents Manual 7-9469-1.1 06/10/09

Contact Information

Changes to this Manual

Bird Technologies Group TX RX Systems Inc.

Sales Support at 716-549-4700 extension 5043

Customer Service at 716-549-4700 extension 5044

Technical Publications at 716-549-4700 extension 5019

We have made every effort to ensure this manual is accurate. If you discover any

errors, or if you have suggestions for improving this manual, please send your

comments to our Angola, New York facility to the attention of the Technical Publications

Department. This manual may be periodically updated. When inquiring about updates to

this manual refer to the manual part number and revision number on the revision page

following the front cover.

TX RX Systems Inc. Manual 7-9469-1.1 06/10/09 Page 1

OVERVIEW

Signal boosters extend radio coverage into areas

where abrupt propagation losses prevent reliable

communication. The system receives an RF signal,

raises its power level, and couples it to an antenna

so that it can be re-radiated. The input signal may

be derived from a receiving antenna or a long run

of radiating coax.

The TXRX model 611-70 channelized signal

booster is designed to operate in the 450 to 470

MHz range. The system is based on a module

design with each module capable of handling one

uplink and one downlink channel simultaneously.

The size of the system can be tailored to the cus-

tomers needs by increasing or decreasing the

number of modules used. Each module is bi-direc-

tional with one downlink and one uplink signal

branch. Each of the two branches in a module are

independently tunable to their required pass fre-

quency via software interface.

The systems part number is used to describe the

configuration of the product. The first three digits

are always 611 and describe the channelized sig-

nal booster product group. The second group of

two digits describe the frequency range (450 to 470

MHz). The next two digit group describes the num-

ber of channel modules while the last letter

describes the mounting method used (the letter “A”

represents rack mounted). Specifications for the

611-70 family of channelized signal boosters are

listed in Table1.

Intermediate

Frequency

Signal

Processing

1st Mixer 2nd Mixer

RF OutRF In

Local

Oscillator

Figure 1: The down converter / up converter process.

Frequency Range 450 - 470 MHz

Number of Carriers

per Channel

1 Uplink

1 Downlink

Nominal Passband

Gain 120 dB

Channel Bandwidth

Standard 25 KHz;

can be programmed to

meet group delay require-

ments

(User Selectable)

Output Power

per Channel + 37 dBm ERP

Maximum Input Level -40 dBm

RF In/Out Impedance 50 Ohms

Alarms Form-C Contacts

Module LED’s

Power

90 - 250 VAC, 50/60 Hz

28 VDC (+/- 5%)

Operating Temperature

Range -30°C to +60°C

Table 1: Specifications

TX RX Systems Inc. Manual 7-9469-1.1 06/10/09 Page 2

Down / Up Conversion

A channelized signal booster has much in common

with a superheterodyne (superhet) receiver. The

incoming signal is converted to a lower frequency

so that single channel selectivity can be obtained.

It is then filtered. Unlike the superhet receiver how-

ever, the signal is not demodulated. Instead, it is

up-converted back to its original frequency where it

is further amplified to reach a useful power level.

Figure 1 shows a simplified block diagram that

illustrates the down/up conversion principle. An

incoming signal at (Freq IN) is applied to the first

mixer along with a signal from a local oscillator

(Freq LO). A third signal at an intermediate fre-

quency (Freq IF) is produced as a result of the mix-

ing. The intermediate frequency is given by the

following relationship:

(1) Freq IF = Freq IN - Freq LO

The IF signal from the mixer then passes through

filtering with single channel bandwidth before being

amplified and passed on to the second mixer. The

second mixer also receives the same local oscilla-

tor signal (Freq LO). The result is a mixing product

frequency at the output of mixer 2. The output fre-

quency (Freq OUT) is given by the following rela-

tionship:

(2) Freq OUT = Freq IF + Freq LO

Substituting equation (1) for the “Freq IF” term in

equation (2) allows the “Freq LO” terms to be can-

celed yielding:

(3) Freq Out = Freq IN

The implication of equation (3) is that the frequency

stability of the signal that is processed by this type

of signal booster is not affected by the frequency

stability of the signal booster itself. Frequency sta-

bility depends only on the stability of the signal

source producing the signal to be boosted. A shift

in the LO frequency of the signal booster will only

cause a shift in the IF frequency with a possible

loss of signal amplitude but no change in the out-

put signal frequency.

UNPACKING

It is important to report any visible damage to the

carrier immediately. It is the customers responsibil-

ity to file damage claims with the carrier within a

short period of time (1 to 5 days). Care should be

taken when removing the unit from the packing box

to avoid damage to the unit.

INSTALLATION

The following sub-sections of the manual discuss

general considerations for installing the booster. All

work should be performed by qualified personnel

and in accordance with local codes.

Location

The layout of the signal distribution system will be

the prime factor in determining the mounting loca-

tion of this unit. However, safety and serviceability

are also key considerations. The unit should be

located where it can not be tampered with by the

general public, yet is easily accessible to service

personnel. Also, consider the weight of the unit and

the possibility for injury if it should become

detached from its mounting for any reason.

The booster needs to be installed such that there

can be unobstructed air flow over and around the

subassemblies. The various subassemblies will

stay warm to the touch during normal operation so

in the interest of equipment longevity, avoid loca-

tions that carry hot exhaust air or are continually

hot.

Antenna Isolation

Antenna isolation between uplink and downlink

should be measured before connecting the signal

booster to the antenna system. This step is neces-

sary to insure that no conditions exist that could

possibly damage the signal booster and should not

be skipped for even the most thoroughly designed

system.

Just like the feedback squeal that can occur when

the microphone and speaker get too close together

in a public address system, a signal booster can

start to self oscillate. This can occur when the iso-

lation between the Uplink and Downlink antennas

does not exceed the signal boosters gain by at

least 15 dB. Oscillation will reduce the effective-

ness of the system and may possibly damage

amplifier stages. Isolation values are relatively

easy to measure with a spectrum analyzer and sig-

nal generator.

REQUIRED EQUIPMENT

The following equipment is required in order to per-

form the antenna isolation measurements.

TX RX Systems Inc. Manual 7-9469-1.1 06/10/09 Page 3

1) Signal generator for the frequencies of interest

capable of a 0 dBm output level. Modulation is

not necessary.

2) Spectrum analyzer that covers the frequencies

of interest and is capable of observing signal

levels down to -100 dBm or better.

3) Double shielded coaxial test cables made from

RG142, RG55 or RG223 coaxial cable.

MEASUREMENT PROCEDURE

To measure the antenna isolation perform the fol-

lowing in a step-by-step fashion.

1) Set the signal generator for a 0 dBm output level

at the center frequency of the boosters pass-

band.

2) Set the spectrum analyzer for the same center

frequency and a sweep width equal to or just

slightly greater than the passband chosen ear-

lier in step 1.

3) Temporarily connect the test leads of the signal

generator and spectrum analyzer together

using a female barrel connector, see Figure 2.

Observe the signal on the analyzer and adjust

the input attenuator of the spectrum analyzer

for a signal level that just reaches the 0 dBm

level at the top of the graticule.

4) Referring to Figure 2, connect the generator test

lead to one side of the antenna system and the

spectrum analyzer to the other then observe the

signal level. The difference between the

observed level and 0 dBm is the isolation

between the sections. If the signal is too weak

to observe, the spectrum analyzer’s bandwidth

may have to be narrowed and it’s input attenua-

tion reduced. The isolation value measured

should exceed the signal booster’s gain figure

by at least 15 dB.

5) Repeat step 4 again with the signal generator

set at the passband edges in order to see if the

Signal Generator

External

Antenna

(YAGI)

Spectrum Analyzer

Isolation (dB)

Zero Loss

Reference

Internal

Signal Distribution

System

(Omni-directional

Antennas)

Figure 2: Typical test equipment interconnection for measuring antenna isolation.

TX RX Systems Inc. Manual 7-9469-1.1 06/10/09 Page 4

isolation is remaining relatively constant over

the complete width of the passband.

6) Repeat the isolation measurements if necessary

at other system passbands to determine the

overall minimum isolation value for the system.

Physical modification of the antenna system

maybe required in order to reach an acceptable

minimum value.

FUNCTIONAL BLOCK DIAGRAM DISCUSSION

Figure 3 is the functional block diagram of the

channelized signal booster model 611-70. Figure

4A and 4B show the front and rear views of the

module housing.

Downlink / Uplink Input Signals

Downlink and Uplink input signals are applied to a

distribution amplifier 3-22340. This is an ultra-low

noise high linearity amplifier with a gain of 18.9 dB.

Refer to schematic 3-22341. Following the distribu-

tion amp is a 6-way power divider which is used to

distribute the signal to individual channel modules.

Downlink signals are applied to the down converter

board of a downlink branch while uplink signals are

applied to the down converter board of an uplink

branch. Any unused output ports of the 6-Way

should be terminated with a 50 ohm load. Signal

processing within the channel module is discussed

in the Channel module section below.

Downlink / Uplink Output Signals

Downlink signals leave the channel module at the

DL OUT connector and are applied to a power

amplifier 8-22290 which has a typical gain of 35

dB. After amplification, signals from multiple mod-

ules are combined by a Hybrid Combiner 3-18317-

1 and fed into combline filtering before being

applied to an antenna. Uplink output signals leave

the channel module at the UL OUT connector and

are applied to an active combiner 3-22319. The

active combiner amplifies and combines signals

from multiple modules. Following the active com-

biner is combline filtering.

Channel Module 3-22322

The channel modules are bi-directional with each

module containing one downlink branch and one

uplink branch. The branches are functionally identi-

cal because the same set of circuit boards are

used in each branch. The uplink and downlink

branches can work on different frequencies within

the modules passband (450 to 470 MHz) but for

either branch the input and output signals will be

the same frequency. Figure 5 is the block diagram

of the channel module.

Active

Receiver

Multicoupler

Active

Channel

Combiner

(one amp

per input)

Duplexer/Filter

Donor

Antenna

Channel Module

20W PA

Coverage

Antenna

System

Channel Module - Downlink

Channel Module - Uplink

Channel Module - Downlink

Channel Module - Uplink

Channel Module - Downlink

Channel Module - Uplink

Active

Receiver

Multicoupler

20W PA

Hybrid Combiner

Figure 3: Functional block diagram of the channelized signal booster.

TX RX Systems Inc. Manual 7-9469-1.1 06/10/09 Page 5

Figure 4A: Module housing front view.

User

Interface

Connector

Power ON

LED

Indicator

Figure 4B: Module housing rear view.

TX RX Systems Inc. Manual 7-9469-1.1 06/10/09 Page 6

Each branch consists of four boards; Digital, Local

Oscillator, Down Converter, and Up Converter. RF

signals enter the branch at the down converter

board where they are filtered, amplified, and con-

verted into a 70 MHz intermediate frequency. The

digital board digitizes the IF signal with an ADC.

The digitized samples are applied to a programma-

ble gated array for digital filtering. The filtered sig-

nals from the array are converted back into analog

by a DAC and output to the up converter board.

The up converter board converts the IF back into

the original UHF signal and outputs it from the

module. The Local Oscillator board generates the

reference signals for mixing and sampling. The

mixing frequency can range from 380 to 400 MHz

and is determined by the user via interface with the

micro controller on the digital board.

OPERATION

Power is applied to the unit by plugging in the AC

power cord. There is a Power-ON LED located on

the front of the unit (near the computer interface

connector) which will illuminate when power is

applied.

Module LED’s

There are six LED indicators on the front of each

channel module, 3 for the uplink branch and 3 for

the downlink branch. The function of indicator

LED’s are listed in Table 2.

RF EXPOSURE

To comply with FCC RF exposure compliance

requirements, a separation distance of at least 100

cm must be maintained between the antenna of

this device and all persons. This device must not

be co-located or operating in conjunction with any

other antenna or transmitter.

10M Ref

Alarm

Logic

Form 'C'

Squelch

RF Out (DL)

RF In (UL)

Out

10 MHz

+28 VDC

I2C

Form

"C"

Contacts

RF Out (UL)

RF In (DL)

LED

Connect

(UL)

LED

Connect

(DL)

LEDs

(3)

5.5V

DAC Out

(2)

Attn Cnl

(4)

ADC

in (2)

Vocm AGC

Cnl (2)

Freq Cnl

(3)

56M (3)

Up Converter Board

3-22302

Interface

Board

3-22315

LED

Board

3-22295

Down Converter Board

3-22308

LO Board

3-22312

Digital Board

3-22310

10M

28V

I2C

Thru Wall Cable

Figure 5: Channel Module block diagram.

TX RX Systems Inc. Manual 7-9469-1.1 06/10/09 Page 7

Status LED

Green (flashing fast) Unit Identification (for several seconds only on command from User Interface)

Orange (slow flash) Unprogrammed unit (no settings set)

Off Unit disabled (no output from module)

Red (slow flash) External reference selected but is absent or not locked

Red (solid ON) Alarm of some kind (current or temp out of limits, LO not locked, filter not set)

Green (solid ON) all is OK

Channel Keyed

Slow Flash Unprogrammed unit (no settings set)

Unit will transmit signal

if CTCSS and DCS disabled then signal present on input above carrier squelch threshold

Else if one is enabled then it means that the selected CTCSS or DCS code has been detected

OFF Unit will not transmit signal

Carrier Detect

Slow Flash Unprogrammed Unit (no settings set)

ON Signal present on input above carrier squelch threshold

OFF No signal present on input above carrier squelch threshold

Table 2: Channel Module Indicator LED’s

TX RX Systems Inc. Manual 7-9469-1.1 06/10/09 Page 8

TX RX Systems Inc. 8625 Industrial Parkway, Angola, NY 14006 Tel: 716-549-4700 Fax: 716-549-4772 sales@txrx.com www.txrx.com

SYSTEMS

INC.

SYSTEMS

INC.

Bird Technologies Group 61170 Channelized Signal Booster User Manual

Bird Technologies Group Channelized Signal Booster

user manual

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